#include <iostream>
#include <cstdio>
#include <string>
#include <pthread.h>
#include <unistd.h>

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; //定义线程锁
pthread_cond_t cond = PTHREAD_COND_INITIALIZER; //定义条件变量

void *active(void *arg)
{
    std::string name = static_cast<const char *>(arg);
    while(true)
    {
        pthread_mutex_lock(&mutex);
        //次处没有对资源是否就绪进行判定
        pthread_cond_wait(&cond, &mutex); //把线放入等待队列
        //被唤醒后继续执行下面的代码
        printf("%s is active!\n", name.c_str());
        pthread_mutex_unlock(&mutex);
    }
}

int main()
{
    pthread_t tid1, tid2, tid3;
    pthread_create(&tid1, nullptr, active, (void*)"thread-1");
    pthread_create(&tid2, nullptr, active, (void*)"thread-2");
    pthread_create(&tid3, nullptr, active, (void*)"thread-3");

    sleep(1);
    printf("Main thread ctrl begin...\n");
    while(true)
    {
        printf("main wakeup thread...\n");
        //主线程进行唤醒所有线程
        pthread_cond_broadcast(&cond);
        sleep(1);
    }
    pthread_join(tid1, nullptr);
    pthread_join(tid2, nullptr);
    pthread_join(tid3, nullptr);
    return 0;
}
